EP 2636910 A1 20130911 - HYDRAULIC DRIVE DEVICE FOR CONSTRUCTION MACHINE
Title (en)
HYDRAULIC DRIVE DEVICE FOR CONSTRUCTION MACHINE
Title (de)
HYDRAULISCHE ANTRIEBSVORRICHTUNG FÜR EINE BAUMASCHINE
Title (fr)
DISPOSITIF À COMMANDE HYDRAULIQUE POUR MACHINE DE CONSTRUCTION
Publication
Application
Priority
- JP 2010248558 A 20101105
- JP 2011075078 W 20111031
Abstract (en)
[Problem] To permit guiding oil of a high pressure in an oil passage section, which communicates a valve device and a filter to each other, to a relief valve by a relatively inexpensive structure even when clogging occurs in a filter arranged in an oil passage communicating the valve device and the relief valve to each other. [Solution] A hydraulic pump (20) and a charge valve (25), to which pressure oil is fed from the hydraulic pump (20) via an oil passage (26), are arranged. Arranged in the charge valve (25) are a valve device, for example, an on/off valve (33) switchable according to pressure oil delivered from the hydraulic pump (20), a relief valve (34) specifying a maximum of switching pressure for the on/off valve (33), and a filter (36) arranged in an oil passage (35) communicating the on/off valve (33) and the relief valve (34) to each other. In the oil passage (35), a check valve (37) is arranged in parallel with the filter (36) such that a flow of pressure oil from a side of the on/off valve (33) toward a side of the relief valve (34) is allowed but a flow of pressure oil from the side of the relief valve (34) toward the side of the on/off valve (33) is prevented.
IPC 8 full level
B01D 35/147 (2006.01); E02F 9/22 (2006.01); F15B 11/028 (2006.01); F15B 21/041 (2019.01)
CPC (source: EP KR)
E02F 9/22 (2013.01 - KR); E02F 9/2217 (2013.01 - EP); E02F 9/225 (2013.01 - EP); E02F 9/226 (2013.01 - EP); F15B 11/028 (2013.01 - KR); F15B 21/04 (2013.01 - KR); F15B 21/041 (2013.01 - EP); F15B 2211/30505 (2013.01 - EP); F15B 2211/50518 (2013.01 - EP); F15B 2211/615 (2013.01 - EP); F15B 2211/625 (2013.01 - EP)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
EP 2636910 A1 20130911; EP 2636910 A4 20160713; EP 2636910 B1 20180620; CN 103201523 A 20130710; CN 103201523 B 20150506; JP 2012097885 A 20120524; JP 5481350 B2 20140423; KR 101850570 B1 20180419; KR 20130143581 A 20131231; WO 2012060331 A1 20120510
DOCDB simple family (application)
EP 11837981 A 20111031; CN 201180053096 A 20111031; JP 2010248558 A 20101105; JP 2011075078 W 20111031; KR 20137011676 A 20111031